theres two of these bumps on the tire. Other front tire is still has good tread. Would i have to replace both if this one is bad?

 

I've heard people say that the 'tumors' don't affect your daily driving but for cost of two tires versus the risk and the cost of **** hitting the fan its just not worth it. Have them replaced at your earliest convenience.

 

That tire needs to be replaced asap, the belts have broken in the sidewall and the only thing keeping the air in the tire and the whole thing together it just the rubber. If the other tire is close in tread depth to the new one you'll be fine. If it's getting on in life then replace both and save the good one for a spare in case you ever need it.

 

I agree with SR71 - best would be to replace both and save the good one for a spare in case you ever need it.

 

Thank you gentlemen. Your comments are much appreciated. Would you recommend I replace the rear tires as well? They are half worn out.